Seems to me, if all Person A can find to talk about is what an idiot Person B is, then Person A needs to make it his business to get his dadgum line straight. And then if he does screw it up, and screw it up in such a way as to insult the intelligence of thousands of Americans who are serving their country, he should say so immediately and apologize, and not try to find a way to make it Person B's fault. Because that is so puerile. Like a little kid who keeps insisting "He started it!" and can't just take his licks and shut up.
Seems to me, if Person A really has something to offer he isn't going to waste time insulting Person B in the first place.